* {
  margin: 0;
  padding: 0;
}
li {
  list-style: none;
}
body {
  background: bisque;
}

.tab-box {
  display: inline-block;
  border: 1px solid #000;
}
.tab-head-div {
  display: flex;
  justify-content: center;
  align-items: center;
  float: left;
  width: 50px;
  height: 30px;
  cursor: pointer;
  /* 鼠标变手 */
}
.tab-body-div {
  display: none;
  border-bottom: none;
}

.tab-head .current {
  border-bottom: none;
}
.tab-body .current {
  display: inline;
  border-top: none;
}

.tab-head-back {
  position: relative;
  left: 0px;
  width: 50px;
  height: 30px;
  background: coral;
  transition: 0.2s;
  z-index: -1;
}
